Triphenylphosphine → (R)-tert-butyl 2,2,4-trimethyl-4-(2-oxo-2-(4-(6-phenylhexyloxy)-3-(trifluoromethyl)phenyl)ethylcarbamoyl)oxazolidine-3-carboxylate

Participants

Reaction Steps

To a solution of (R)-tert-butyl 4-(2-(4-hydroxy-3-(trifluoromethyl)phenyl)-2-oxoethylcarbamoyl)-2,2,4-trimethyloxazolidine-3-carboxylate (114 mg, 0.25 mmol, 1.0 equiv) and 6-phenylhexan-1-ol (45 mg, 0.25 mmol, 1.0 equiv) in DCM (1 mL) was added polymer bond PPh3 (125 mg, 0.75 mmol, 3.0 equiv). The reaction mixture was stirred at rt for 0.5 hour and cooled to 0° C. A solution of DIAD (0.053 mL, 0.25 mmol, 1.0 equiv) in DCM (0.5 mL) was added drop wise to the reaction mixture. The reaction mixture was stirred at rt for 2 hours, filtered and evaporated under reduced pressure to give a residue, which was purified by SiO2 column chromatograph (30-50% EtOAc in hexanes) to give (R)-tert-butyl 2,2,4-trimethyl-4-(2-oxo-2-(4-(6-phenylhexyloxy)-3-(trifluoromethyl)phenyl)ethylcarbamoyl)oxazolidine-3-carboxylate in 75% (155 mg) yield. HPLC retention time on a C18 column (30×4.6 mm, 3.5μ) was 3.31 min with gradient 50-95% acetonitrile-H2O (0.1% TFA) in 3.5 min as mobile phase. MS (ESI, M+H+)=621.6.

Provenance & Evidence